Using HP-65 Sunrise/Sunset

[Matt Agajanian]

Hi there. I have the Cuvee RPN-65 iOS app. I also have some questions.

As I remember from my SR-56 and TI-58C days, using nav programs meant longitudes and latitudes followed a sign convention (I think West and South were entered as negative numbers (at least for TI programs). For the 65 program I mentioned in the title and found at http://www.cuveesoft.ch/rpn65/p09.html#NAV1 in the Nav Pac program 16 , what is the sign convention for latitudes and longitude? Thank you.